The attached pic is part of a screenshot of what I see looking at the Tubes / Valves index page.

Firefox 4, Ad-block plus, Ghostery and NoScript.

Yes, that is an advertisement (banner) for one of our sponsors, not an official forum statement. I hadn't considered that members might find the advertising confusing. The banner actually is a link to the respective advertiser.

I seriously doubt the guitar amp posts up in the tubes section are there from confusion. I suspect someone not familiar with this board arrives, sees "tube amps" and looks no further.

How many times have I been in a thread about some product and a new person pops in with "where can I get a schematic for that?" And the answer is "back on page one of this thread, post #7." Many people don't look once they see anything relating to their situation.